Question

A number is added to $15$. The new number is multiplied by $3$ to give $60$. Find the number.

Answer 1

Let the number be $x$

If the number is added to $15$ to give new number

Then the new number be $15+x$

If the new number is multiplied by $3$ to give $60$

$⟹3(15+x)=60$

$⟹15+x=\frac{60}{3}$

$⟹15+x=20$

$⟹x=5$

The number is $5$